I recommend Zima/Chapman and Wolfe to new engineers in our department
(compiler development at CONVEX Computer Corp.) who wish to learn more about
vectorization and parallelization. I would not recommend the other two books
for this purpose, though they contain much useful material.

Wolfe and Polychronopoulos are updated versions of doctoral dissertations.
Gelernter and Nicolau is a collection of papers, essentially a conference
proceedings.